import 'dart:io';

void main() {
  final files = <String, String>{
    't_settings_performance.dart': 'TSettingsPerformance',
    't_settings_privacy.dart': 'TSettingsPrivacy',
    't_settings_advanced.dart': 'TSettingsAdvanced',
    't_settings_cache.dart': 'TSettingsCache',
    't_settings_permission.dart': 'TSettingsPermission',
    't_settings_data_collection.dart': 'TSettingsDataCollection',
  };

  const baseDir = 'e:\\project\\flutter\\f\\xianyan\\lib\\l10n\\types';

  for (final entry in files.entries) {
    final file = File('$baseDir\\${entry.key}');
    final className = entry.value;
    if (!file.existsSync()) {
      print('NOT FOUND: ${entry.key}');
      continue;
    }

    var content = file.readAsStringSync();

    // Find the fromMap method
    final startPattern = 'static $className fromMap(Map<String, String> map)';
    final startIdx = content.indexOf(startPattern);
    if (startIdx == -1) {
      print('NO fromMap found: ${entry.key}');
      continue;
    }

    // Find the end of the method (matching closing );
    var depth = 0;
    var endIdx = startIdx;
    var foundOpen = false;
    for (var i = startIdx; i < content.length; i++) {
      if (content[i] == '(') {
        depth++;
        foundOpen = true;
      } else if (content[i] == ')') {
        depth--;
      }
      if (foundOpen && depth == 0) {
        // Find the semicolon
        endIdx = content.indexOf(';', i);
        if (endIdx == -1) endIdx = i;
        break;
      }
    }

    final oldMethod = content.substring(startIdx, endIdx + 1);

    // Parse all field: map['key'] ?? '' patterns
    final fieldPattern = RegExp(r"(\w+):\s*map\['([^']+)'\]\s*\?\?\s*''");
    final matches = fieldPattern.allMatches(oldMethod);

    final newLines = <String>[];
    for (final m in matches) {
      final fieldName = m.group(1)!;
      final mapKey = m.group(2)!;
      newLines.add('    $fieldName: map[\'$mapKey\']?.isNotEmpty == true');
      newLines.add('        ? map[\'$mapKey\']!');
      newLines.add('        : (fallback?.$fieldName ?? \'\'),');
    }

    final newMethod =
        'static $className fromMap(Map<String, String> map,\n'
        '        {$className? fallback}) =>\n'
        '    $className(\n'
        '${newLines.join('\n')}\n'
        '  );';

    content =
        content.substring(0, startIdx) +
        newMethod +
        content.substring(endIdx + 1);
    file.writeAsStringSync(content);
    print('OK: ${entry.key} (${matches.length} fields)');
  }
}